Motor mounting



-1 1942- J'. J. MCCABE EIALJ 2,292,536

MOTOR MOUNTING Original Filed May 1, 1934 INVENTORS JOHN J: M CABE P405- PEA/V72 Jud/u. m

ATTORNEY.

Patented A g. '11, 1942 UNITED STATES PATENT" OFFICE.

MOTOR MOUNTING John J. McCabe, Worcester, Mass, andPaul E. Frantz,Euclid, Ohio, assignors to The Apex Electrical Manufacturing Company,Cleveland, Ohio, a corporation of Ohio Original application May 1, 1934,Serial No.

Divided and this application Novemher a, 1939, Serial No. 303,102

3 Claims.

Our invention relates to a motor mounting, and more particularly toa'resilient type of motor mounting such as for instance the typedisclosed in our copending application Serial No. 723,422, filed May 1,l934,-nw Patent No. 2,185,-

215, of which the instant application is a division.

It is among the objects of our invention to provide a flexible mountingfor the motor or power v unit in a belt-driven assembly wherein thepower mechanism.

It is a further object of our invention to pro-' vide a motor mountingin accordance with the preceding objects wherein the motor is supportedfor movement about an axis parallel to the our invention may beadvantageously employed in other driving and driven assemblies.

It will be understood by those skilled in the art that in a belt-drivenassembly such as illustrated in Figure 1, wherein the motor pulley 9 isturning clockwise to drive the belt 1 in the direction indicated byarrow A, a counter-clockwise reaction as indicated at B is produced inthe stator of the motor.

It will also be understood that because of the high starting load, suchas found in refrigerant compressors, it is desirable to permit the motorpulley t o slip slightly with respect to the belt so that the motor mayacquire a speed at which it is efliciently capable of driving thecompressor. It is also desirable that as soon as the motor has acquiredan eflicient speed with respect to the load, it will effect a non-slipdrive to the belt.

rotor axis and at one side-of a vertical plane through the rotor axiswhereby the weight of the motor tends to turn the motor in one directionabout its mounting axis and the torque reactionsincident tdrdrive tendto turn the motor, in an opposite direction with respect to said sameaxis.

Further objects relating to simplicity, sturdiness in construction andeconomies in manufacture, will appear from the following description andthe appended drawing, wherein:

' Figure 1 is an elevation showing a belt-driven assembly provided witha motor mounting made according to our invention;

Figure 2 is anelevation taken at right angles to the viewot Figure 1showing the motor mounting made according to our invention;

. We have obtained the above-mentioned desirable results and the objectsheretofore outlined in this application by mounting the motor 8 in 7 itsentirety so that it may move within certain limits and as permitted bycertain restraining forces about the axis indicated at C in. Figure 2.

The motor base preferably comprises a flat metal portion [0 providedwith a pair of spaced, upstanding ears It and I2. The ears are spacedwith respect to each other and with respectto the dimensions of themotor so as to permit the insertion between each ear and the motor 0! aresilient connection indicated inits entirety as at I3; The connectionl3 comprises a pair of oppositely-extending bolts or studs l4 andllhaving threaded shanks and enlarged flat head portions l1 and I6,respectively. The studs II and I5 are securely bonded to each other by aresilient block or rubber l8 or the like which may be vulcanized orotherwise securedto' the enlarged head portions l1 and 16, respectively.

The mounting units I! may be secured to the motor as indicated in Figure2 bythe nut and washer fastening 20 within the motor end tape.

A. The supporting ears II and ii are slotted as Figure 3 is an end viewof the motor mounting shown in Figure 2; and

Figure 4 ma sectional view, taken through the resilient mounting unit asindicated in lines l-loIFigure3.

We have illustrated our invention in this applicationas the inventionmay, be utilized in a belt-driven assembly such as .is conventional inindicated at 21 in Figure.5 and a second nut and washer assembly 22 maybe tightened on the shank l5 so as to clamp the resilient mounting l3 toits supporting ear.

refrigeration systems wherein a refrigerant com- Y pressor 8 is drivenby a motor I through a belt I.

'It will be appreciated as the description pro- From theforegoing-description of the structural elements entering into a motorsupport made according to. our invention, it will be.observed that themotor may rock. about the axis indicated etc in response to torquereactions caused by variations in load. Such movements about the axis Care cushioned and dampened by ceeds that a motor mounting made accordingto the resilient rubber block ll. Since the axis C is disposed at oneside of the vertical plane through the motor axis, the weight of themotor tends to turn the motor in its entirety in a clockwise directionwith respect to the axis C.

Referring again to Figure 1, it will be observed that theclockwisetendency of the motor to turn about axis 0, due to the weightof the motor is opposed and counteracted by the counter-clockwisetendency of the motor to turn in the di-. rection of arrow B in responseto torque reaction in the stator. Since the shank or threaded portionsi4 and I5 of the connector element are intended to be securely clampedto the motor and supporting ear, respectively, both the clockwise andcounterclockwise tendency of the motor to turn about axis C produces atorsional and sheering strain in the rubber block element l8.

Upon starting the motor and compressor assembly such as shown in Figure1, it will be ob-v served the first increment of motor reaction indirection of arrow B is utilized to overcome clockwise tuming effectabout axis C caused by the weight of the motor. In other words, thetorsional strain in the rubber block I8, present in the motor in itsstatic condition, aids the torque reaction in the stator in moving theentire motor about its axis in the direction of the arrow B.

The eccentricity of the axis C with respect to the rotor axis of themotor and the size and character of the rubber mounting l3, are preferably selected with respect to the torque and load characteristics ofthe assembly so that the motor will move about the axis C in response totorque load variations to maintain the most efflcient slipping anddriving relationship with the belt I.

Although we have shown and described one form of our invention in thisapplication in considerable detail, it will be appreciated by thoseskilled in the art that numerous modifications may be made therein andthat the invention itselfmay be embodied in other assemblies than- 1. Incombination, driving and driven machines connected by a belt, saiddriving machine comprising a motor having a stator and a rotor providedwith a pulley, said motor being designed for pulley rotation to effecttension in the lower reach of the belt, means to yieldingly mount saidmotor for movement about an axis parallel to the motor shaft, includinga base, brackets onnsaid base having resilient connections with saidstator at one side of a plane through the rotor axis normal to the base,said resilient connections positioned on that side of said plane whichis remote from the driven machine, to effect a bias of the drivingmachine towards the driven machine by the weight of the motor.

2. In combination, driving and driven machines having pulleys connectedby a belt, a base for said driving machine, said driving'machinecomprising a motor having a stator and a rotor, said motor having adirectional rotation to effect tension in that reach of the beltadjacent to the base, means to yieldingly mount said motor for movementabout an axis parallel to the axis of the rotor including brackets onsaid base havin resilient connections with said stator on one side ofthe plane through the rotor axis normal to the base, said resilientconnections positioned on that side of said plane which is remote fromthe driven machine to effect a bias of the driving machine toward thedriven machine by the weight of the motor.

3. In a motor mounting, a motor base having laterally extending cars, amotor comprising a stator and a rotor, means resiliently connecting thestator. to said cars at one side of a plane through the axis of therotor normal to the base to provide for limited movement of the motorabout an axis parallel to the rotor axis, said motor having a rotorrotation in a direction away from the base on the same side of saidplane as said means connecting the stator to the base to effect bodilymovement of the motor away from the base in response to the torquereaction the stator.

PAUL E. FRANIZ. JOHN J. MCCABE.

